DISCOVER is a NIS study to describe the disease management patterns and clinical evolution over three years in type 2 diabetes mellitus patients initiating a second line anti-diabetic treatment. This study is a multi-country, multicenter, observational, prospective, longitudinal cohort study. The patients will be recruitted from countries in Latin America, Europe and Asia pac. It is estimated that approximately 13350 patients will be enrolled in total with each patient followed up for 3 years.